If I recall, the buttons are not part of the display - they just happen to be mounted next to it on a single strip that contains those buttons. Not too difficult to replace, at least on the non-tilting screen machines.
Gary

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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)